1.7.7 PIC32CXMTC + MCP3912, PGA = 1, CH0: I_A, CH1: I_B, CH2: V_A, CH3: V_B

AFE_SELECTION = 0x00000003

AFE_CTRL_0 = 0x0B000000 (dithering: on, maximum strength; boost: x1)

CHANNEL_MATRIX = 0xFFFF3120